16802 engine cooling system
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16802 engine cooling system

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16802 engine cooling system 16802 engine cooling system Presentation Transcript

  • ENGINE COOLING SYSTEM
  • Purpose Keep engine at its most efficient temperature In combustion process the temperature of gases is 2200°c Coming to walls of cylinder it is 180 - 260°c This temperature should maintain More heat should not absorb by cooling. up to 35% of heat
  • Types of Cooling Air cooling Liquid cooling
  • Air cooled Engine Metal fine are extended to cylinder walls Engine exposed to air Shrouds and fans are used in some engines Engines are open not grouped
  • Water Cooled Engines Coolant circulate around cylinder walls It takes the heat by convection process Coefficient of heat transfer is higher in liquids Coolant is a mixture of water and antifreeze. (Normally 40/60 mixture)
  • How it Works: Liquid Cooled Systems - A pressurized closed circulation system
  • Parts of a Liquid Cooling System  Radiator & Pressure Cap  Fan & Belt  Coolant Pump  Water Jackets  Thermostat  Hoses  Coolant
  • Water jackets Open space between outside and inside walls of cylinder The coolant circulates freely around engine hot spots It includes valve seats and guides and upper parts of cylinder where piston and rings slides
  • Water jackets
  • Water pump Impeller type centrifugal pumps Placed at front end of cylinder block and back to radiator It can circulate 28,390 lit of coolant per hour It consist inlet, outlet, impeller, bearings and seals
  • Water Pump
  • Engine Fan To pull air through radiator It improves cooling at slow speeds Four to six blades, shrouds Variable speed fan Flexible blade fan Electric fans
  • Radiator Heat exchanger device It holds large volume coolant in close contact with large amount of air Cores and pipes Inlet tank and sink Down flow and cross flow
  • Expansion tanks Separate plastic reservoir Recovery tank Connected to over flow Coolant in engine is expands…contrasts Surge tank An advantage to the use of an expansion tank is that it eliminates almost all air bubbles from the cooling system. Coolant without bubbles absorbs heat better.
  • Transmission oil coolers
  • Thermostat Thermostatic device Wax pellet 85 to 90°c It is placed at passage from cylinder head to upper tank of radiator
  • Radiator Pressure cap Sealing and pressurizing
  • Anti Freeze Solutions An antifreeze is a chemical additive which lowers the freezing point of a water-based liquid Lowers galvanic corrosion Maintain small viscosity to water methanol (methyl alcohol) propylene glycol 5% additives sodium silicate, disodium phosphate, sodium molybdate, sodium borate, and dextrin dye (commonly a green, red, orange, yellow, or blue fluorescent)
  • Temperature indicator Balancing coil gauge Bimetallic thermostat gauge Indicator light